Generalized Gordon identities, Hara theorem and weak radiative hyperon decays
نویسندگان
چکیده
منابع مشابه
Hara Theorem, GIM Model, and Asymmetry in Weak Radiative Hyperon Decays
It is shown that in the framework of GIM model, the parity-violating (PV) Σ+(uus) ⇒ p(uud) + γ decay amplitude does not vanish but just transforms into another PV decay amplitude, namely, of the Ωcc(ccs) → Ξcc(ccd) + γ decay. The known result is used that the relevant part of the CP-invariant effective current× current Hamiltonian changes sign under simultaneous quark changes d ↔ s and u ↔ c. S...
متن کاملAlternative Form of the Parity-Violating Current for the Hyperon Weak Radiative Decays and Hara Theorem
It is shown that upon considering an alternative form of a parity-violating part of the transition electromagnetic current it is possible to reformulate Hara theorem in a way that it does not forbid any more nonzero asymmetry in the hyperon weak radiative decays Σ+ → p + γ and Ξ− → Σ− + γ in the limit of exact SU(3)f symmetry thus resolving a contradiction with the data and maybe revealing hith...
متن کاملWeak Radiative Hyperon Decays
It is shown that an alternative form of the parity-nonconserving (PNC) transition electromagnetic current resolves partly a puzzle with the Hara theorem. New formulation of it has allowed PNC weak radiative hyperon transitions of the charged hyperons Σ+ ⇒ p + γ and Ξ ⇒ Σ + γ revealing hitherto unseen transition toroid dipole moment.
متن کاملHyperon weak radiative decays in chiral perturbation theory.
We investigate the leading-order amplitudes for weak radiative decays of hyperons in chiral perturbation theory. We consistently include contributions from the next-to-leading order weak-interaction Lagrangian. It is shown that due to these terms Hara’s theorem is violated. The data for the decays of charged hyperons can be easily accounted for. However, at this order in the chiral expansion, t...
متن کاملResonances in radiative hyperon decays
The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory. Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated. We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parame...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)00045-3